Being able to identify which formula to use, sine or cosine, and when, is necessary to answer questions on this topic successfully. Check you are confident in how to use the sine and cosine rules.

Learn all about the trigonometry of right triangles. A right triangle is a triangle that has 90 degrees as one of its angles. The trigonometric identities of right triangles give us the relationship ...

Associated Press writer Mike Schneider, in "Governor Flunks Geometry Pop Quiz" [Wednesday, page B1], indicated that the governor should have known the angles of a 3-4-5 triangle. The only answer that ...